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関連する概念動画

Interference and Diffraction02:18

Interference and Diffraction

32.2K
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Reflection of Waves01:07

Reflection of Waves

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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
3.7K
Shock Waves01:16

Shock Waves

2.0K
While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
2.0K
Travelling Waves01:04

Travelling Waves

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A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is...
5.2K
Interference and Superposition of Waves01:07

Interference and Superposition of Waves

5.0K
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
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Updated: Jun 12, 2025

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing

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三次元波折り

M L McAllister1, S Draycott2, R Calvert3

  • 1Department of Engineering Science, University of Oxford, Oxford, UK. mark.mcallister@trinity.ox.ac.uk.

Nature
|September 18, 2024
PubMed
まとめ
この要約は機械生成です。

海洋波の三次元断裂は二次元モデルとは大きく異なる. 方向的な広がりが増加すると,突破開始の傾きが2倍になり,新しい突破体制が明らかになり,空海交流とオフショア構造の既存のモデルに挑戦します.

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Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
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関連する実験動画

Last Updated: Jun 12, 2025

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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科学分野:

  • 流体力学
  • 海洋学
  • 波の力学

背景:

  • 表面波の破裂は,空気と海の相互作用における重要なプロセスです.
  • ほとんどの研究では 2次元波が想定されていますが 海の波は本質的に 3次元です
  • 波の発生と特徴に対する三次元性の影響は,まだ十分に理解されていません.

研究 の 目的:

  • 表面波の断裂に対する三次元性の影響を実験的に調査する.
  • 方向的に広がる波と一方的に広がる波の断裂特性を比較する.
  • 三次元波場における異なる断裂レジームを特定し,特徴づけること.

主な方法:

  • 三次元表面波を生成および分析するために実験的な波タンク研究が行われました.
  • 波の傾きと断裂の始まりは,方向的な拡散の異なる程度で測定されました.
  • 視覚的観測と分析により,異なる破裂レジームが特定されました.

主要な成果:

  • 一方向波と比較して,最も方向的に広がった波の突起率が倍増した.
  • 移動波の断裂,静止波の断裂,移動波の静止波の断裂という 3 つの異なる断裂方式が特定されました.
  • 3次元の波は,2次元の波よりもかなり急くなることもあり,その限界は明らかではない.

結論:

  • 三次元性は 表面波の発生と特徴を 根本的に変化させます
  • 波の断裂,エネルギーの分散,空気と海の交換の計算のための既存の二次元モデルは,方向的に広がる海には不十分かもしれません.
  • 複雑な海の状態でオフショア構造を設計するための現在の方法論に挑戦しています